British TuhificidcV. By Rev. H. Friend. 277 



First found at Kew, August 1911, and since discovered in glean- 

 ings from the neighbourhood of Battle and Herstinonceux, Sussex, 

 and various localities in Derbyshire, Notts, and Leicestershire ; 

 Elver Lea, Tottenham, in mud kindly sent to me by Mr. Todd, 

 September 30, with L. trisetosus Friend, and other interesting 

 forms. 



9. Limnodrilus nervosus sp.n. 



A very small, pale-coloured worm, at most 10 mm. in length, 

 and about 40 segments. Chloragogen cells begin in segment 6, 

 transparent and delicate, easily breaking up. Pharynx in seg- 

 ments 2-3 ; large cellular nephridia in (3/7, 7/8, recommencing in 

 12/13. Hearts in 8 and 9. Head pointed, as wide at the base as 

 the first segment, or wider. Setaj 3 per bundle in segments 2-6, 

 with large upper tooth (fig. 45). Occasionally a fourth present as 

 a new growth. From segment 7 backwards 2 sette only per bundle. 

 Teeth equal ; the length of the setee being almost one-third the 



Fig. 45. Fig. 46. 



diameter of the body. The nerve-ganglia in segments 1-5 with 

 wide expansions; bifurcation in front very strong (fig. 46). 



This interesting addition to our lists was found with three other 

 species of Limnodrilus, and two species of Tuhifex, in a sample of 

 mud from a cattle pool near Smisby, as recorded above, September 

 27, 1911. Found on October 3 on banks of stream at Stretton-en- 

 le-field. 



10. Limnodrilus trisetosus sp. n. 



Small, tender worm, about 10 mm. long, of 40 or more segments. 

 Head as long as broad when at rest, pointed when in motion. 

 Segments annulated, those in front, as is often the case, with a 

 wide and a narrow annulus. Setse 3 throughout. In nearly every 

 other species the number is greater in fr(jnt than behind. Earely 

 a seta has fallen out, leaving 2 ; or a young one is forming. No 

 ventral setae on girdle-segment, 2 or 3 dorsally. The lower tooth 

 somewhat (but only slightly) longer than upper, not widely sepa- 

 rated (fig. 47), neat and well-formed, not coarse like those of papil- 

 losus and udekemianus. Pharynx reaches to the end of the 3rd 

 segment. Chloragogen cells begin in 5, and from the gii'dle back- 



